This paper describes an original method based on the Fourier transform, developed in order to determine the characteristics of a signal containing fluctuating harmonics. Problems arising from applying the Fourier transform to signals that contain an infinite number of components are mentioned, and the way to overcome them is explained. Some simulations have been performed to prove the efficiency of the method.

This paper describes the design, realization and basic characterization of the high current measurement system based on Rogowski sensor using an electrooptical transfer of the measuring signal. We present the principal schemes of the system and results of linearity measurements at 50 Hz frequency. The system is aimed for the on-site measurements on the distribution grids.

The talk presents an overview on relevant climate observation needs. The main focus is on the role of remote sensing methods in the context of the United Nations Framework Convention on Climate Change (UNFCCC) Kyoto protocol. In particular, the metrological challenges of a reliable earth observation for climate change detection and verification are discussed.

Leakage detection methods are used to reveal liquid leaks in pipelines for many applications, namely, waterworks, oil pipelines, industry heat exchangers, etc.. The configuration of pipeline is a key issue because it impacts on the effectiveness of the method to be used and, consequently, on the results to be counterchecked. This paper proposes an improvement of impedance method for zigzag pipeline by carrying out an experimental frequency analysis that has been compared with other methods based on frequency response. Hence, impedance method is generally used for simple pipeline configurations because complicated pipelines with many curves introduce difficulties and major uncertainties in the calculation of characteristic impedance and in the statement of boundary conditions. The paper illustrates the case of a water pipeline where the leakage is acquired thanks to pressure transducers.

A practical method with high accuracy in generation and application of error values for calibration of current transformer test sets is described. A PC-controlled three-phase power source with a standard wattmeter is used for generating the nominal and error test currents while an electronically compensated current comparator is used to provide summation and subtraction of them, precisely. With this method, any ratio error and phase displacement value could be generated automatically and nominal and test currents could be grounded on the test set safely. Because of its high accurate ratio and phase error generating capability, any type of test set regardless of its operating principles could be calibrated.